What is one visible change in male secondary sexual characteristics during puberty?

During puberty, males experience several noticeable changes due to hormonal influences, particularly testosterone. One prominent change is the development of secondary sexual characteristics, which includes the darkening and coarsening of body hair. This change in hair color and texture is driven by an increase in androgen levels and is a hallmark of male puberty.

Darker hair signifies the maturation of hair follicles and the body’s preparation for adult characteristics. This change isn't just limited to the hair on their heads; it also affects facial hair, chest hair, and hair in other areas of the body. This development is often a visible marker that males are entering puberty and moving towards adulthood.

While increased height is also a significant change during puberty, it does not specifically pertain to secondary sexual characteristics. Widening of hips is more related to female development, and longer fingers do not conform to the established markers of secondary sexual characteristics in males. Therefore, the darkening of hair is a clear and distinct visible change that aligns with the male secondary sexual development during this stage of growth.